Logarithmic generator (CB7593E)

This circuit has a 100 dB dynamic We found it in a Popular Electronics from the 90s. Equivalent operational can be used.

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Discrete Precision Regulator (CB15719E)
The voltage regulator circuit described is highly accurate and uses discrete components...
WWV 10 MHz converter (CB9184E)
WWV is the standard frequency station of the United States government. This station broadcasts a...
Voltage Detector for Battery Chargers (CB6061E)
Based on a 555, this 80's American documentation circuit detects the voltage of a battery and can then...